HP Color LaserJet Enterprise CM4540 Service Manual - Page 695

Problem The fax accessory is receiving faxes but is not sending them. Outgoing fax calls keep dialing. Faxes you send are not arriving at the receiving fax machine. Cause Solution Your phone line might be noisy or poor quality Try using a lower baud rate to improve the reliability of transmission. See maximum baud rate setting. A call-waiting feature might be active Verify that the fax telephone line does not have an activated call-waiting feature. A call-waiting notice can interrupt a fax call in progress, which causes a communication error. If the fax accessory is on a PBX system, the PBX system might be generating a dial tone the fax accessory cannot detect. Disable the detect dial tone setting. There might be a poor phone connection. Try again later. The fax machine to which you are sending might be malfunctioning. Try sending to another fax machine. Your phone line might not be working. Disconnect the fax accessory from the phone jack, and connect a phone. Try to make a phone call to ensure the phone line is working. The fax accessory automatically redials a fax number if the Redial on Busy option is set to on or if the Redial On No Answer is set on. This is normal operation. If you do not want the fax to retry, set Redial on Busy to 0 and set Redial On No Answer to 0. The receiving fax machine might be turned off or might have an error condition, such as being out of paper. Call the recipient to make sure the fax machine is turned on and ready to receive faxes. A fax might be in memory because it is waiting to redial a busy number, or there are other jobs ahead of it waiting to be sent. If a fax job is in memory for either of these reasons, an entry for the job appears in the fax log. Print the fax activity log, and check the Result column for jobs with a Pending designation. Error codes If a fax problem occurs which prevents or interrupts sending or receiving of a fax, an error code is generated that will help in determining the cause of the problem. Error codes show up in the fax activity log, the fax call report, and the T.30 Protocol Trace. Print one of these three reports to obtain the error code. A detailed description of the error codes and the appropriate action can be found at www.hp.com by searching for HP LaserJet Analog Fax Accessory 500. Fax error messages When an analog fax is sent or received on an HP LaserJet product, any errors that occur during the fax process will be displayed on the product control panel and entered into the fax reports. Fax errors can occur for many reasons and often they are due to interruptions or noise on the telephone connection. ENWW Solve fax problems 643